MCQ On Biomolecule Class-12 » Chemistry-Papers

Which of the following is the correct statement?

Proteins are composed of only one type of amino acid

Starch is a polymer of α-glucose

Amylose is not a component of starch

Deficiency of vitamin E causes

Muscular weakness

Sterility Anaemia

Scurvy

Vitamin A is present in-

butter

milk

all of these

fish liver oil

The two monosaccharide units obtained on hydrolysis of disaccharide may be

different

same

both

Vitamin C must be supplied regularly in diet because

it is fat soluble hence stored in the body and cannot be used on regular basis

it is water soluble hence excreted in urine and can’t be stored in the body

it is water soluble hence used by the body on daily basis and is to be supplied regularly

Glucose cannot be classified as ?

Hexose

Carbohydrate

Oligosaccharide

Aldose

Which one of the following is non-reducing sugar?

Fructose

Maltose

Glucose

Sucrose

Which of the following bases is not present in RNA?

Thymine

Cytosine

Adenine

How many amino acids (approximately) are involved during the synthesis of protein?

Which of the following statements is not correct?

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

Select the base which is not common in DNA and RNA.

Uracil (U)

Guanine (B)

Adenine (A)

Cytosine (C)

D-Glucose and L-Glucose are

diastereomers

anomers

epimers

enantiomers

Osazone formation involves only 2 carbon atoms of glucose because of

chelation

oxidation

hydrolysis

reduction

Identify the pair of epimers

D-glucose and L-glucose

D-glucose and D-fructose

D-glucose and D-mannose

Proteins are the polymers of -amino acids and they are connected to each other by ------

ionic bond

peptide bond

coordinate bond

Fehling’s solution test is given by

lactose

fructose

all of these

glucose

Which carbohydrate is used in silvering of mirror?

(B) Fructose

(D) B and C

(A) Sucrose

Find out the correct option among the following statements.

Fehling’s solution and Tollen’s reagent are non-reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Maltose and lactose are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-galactose

D-glucose

D-fructose

D-mannose

Biuret test is used for

Sugar

Fats

Proteins

Carbohydrates have

> C = O group

All

–OH group

–CHO group

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin D

vitamin H

vitamin B12

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

glucose and fructose

glucose and sucrose

fructose and sucrose

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

5’ and 5’

3’ and 3’

1’ and 5’

5’ and 3’

In iodine test of starch which colour of ppt had been observed

blue

red

black

Which is a fat soluble vitamin?

Vitamin B6

Vitamin A

Vitamin C

Molisch’s test reagent is

both

1% of β-Napthol in alcohol

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Oligosaccharide

Polysaccharide

Monosaccharide

Which one of the following is reducing sugar?

Cellulose

Glycogen

Fructose

Starch

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 3)

(n – 2)

(n – 1)

Millon’s test is given by

Proteins

ester

Sucrose

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACTGCA

ATACACTC

ATACTGAC

Guanine is an example of

a nitrogenous base

a nucleotide

a nucleoside

Which of the following vitamins is water soluble?

Riboflavin

Vitamin E

Vitamin D

Fructose reduce Tollen’s reagent due to

primary alcoholic group

enolisation of fructose followed by conversion of aldehyde by base

secondary alcoholic group